<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>会员登录系统</title>
    <style>
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }

        body {
            background: #02195b url(images/cloud.png) no-repeat scroll 0 270px;


        }

        .box {
            position: relative;
            margin-top: 100px;
        }

        .box ul li {
            list-style: none;
            text-align: center;

        }

        ul li:first-child {

            font-size: 58px;
            font-weight: 700;
            color:#eff1f8;
        }

        input {
            width: 335px;
            height: 50px;
            border-radius: 30px;
            outline: none;
            font-size: 20px;
            margin-bottom: 10px;
            margin-top: 10px;
            padding: 20px;
        }

        input[name="VerificationCode"] {
            width: 170px;
            background: #0a3c78;
            color: #eff1f8;

        }

        .box ul .a {
            margin-left: -161px;
        }

        .box ul li .imges {
            position: absolute;
            top: 230px;
            left: 782px;
            width: 88px;
            height: 41px;
            line-height: 50px;
        }

        .box ul li .imges img {
            width: 100%;
            height: 100%;
        }

        .box ul li .updata {
            position: absolute;
            top: 240px;
            left: 884px;
            color: #eff1f8;
        }

        input[name="admin"] {
            background: #0a3c78;
            color: #eff1f8;
          
        }

        input[type="password"] {
            background: #0a3c78;
            color: #eff1f8;
        }

        input[type="submit"] {
            background: #1ba5ef;
            line-height: 8px;
            color: #eff1f8;
        }

        input:focus{
            background: #1f215b;
        }
        input:hover{
            background: #1f215b;
        }
        #submit:hover{
            background: #1ba5ef;
        }
       
            .footer {
                margin-left: 545px;
                margin-top: 100px;
            }
    </style>
</head>

<body>
    <div class="box">
        <form action="#">
            <ul>
                <li>会员登录系统</li>
                <!-- value="请输入用户名" 与 placeholder="请输入用户名"的区别
                    value的值在控件中一直展示除非用户手动在控件删除
                    placeholder所展现的值不会一直展示当所在控件获得鼠标焦点后会在控件下方留下水印但不会消失除非键入数据 -->

                    <!-- required的作用：当添加这个属性之后所在控件不能为空 -->
                <li><input type="text" name="admin"  required placeholder="请输入用户名"></li>
                <li><input type="password"  placeholder="请输入密码" required></li>
                <li class="a"><input type="text"  placeholder="请输入验证码" name="VerificationCode">
                    <div class="imges"><img src="images/验证码.png" alt=""></div>
                    <div class="updata">换一张</div>
                </li>
                <li><input type="submit" value="立即登录" id="submit"></li>
            </ul>
        </form>
        <div class="footer"> <a>关于我们@12345678 &nbsp;&nbsp;|&nbsp; &nbsp;</a> <a>Copyright © 2019 木木夕  保留所有权利</a> </div>
    </div>
</body>

</html>